Please check for the presence of the countChars function before calling it

Hi there,

In aioseop_module_class.php starting around line 1254, some inline JavaScript runs in the post editor aiseop metabox:

if ( !empty( $options['count'] ) ) {
	$n++;
	$attr .= " onKeyDown='countChars(document.{$this->form}.$name,document.{$this->form}.{$prefix}length$n)' onKeyUp='countChars(document.{$this->form}.$name,document.{$this->form}.{$prefix}length$n)'";
	$onload = "countChars(document.{$this->form}.$name,document.{$this->form}.{$prefix}length$n);";
}

There’s a problem that happens when the file that defines the countChars function isn’t enqueued. Why isn’t it enqueued? Because there’s a conditional wrapped around the part where aiosep_module.js is enqueued.

The conditional check on whether to enqueue aiosep_module.js doesn’t always work as expected. When the JS file isn’t loaded, and there’s a metabox in the post editor, it creates a bad experience for the user because they end up with a post editor with broken JavaScript, with this JavaScript error:

Uncaught ReferenceError: countChars is not defined

Please check if this function exists before calling it to avoid the error.

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